Iodine Clock Reaction Lab
Tyler Lundhagen, Daniel Perez, Matthew J. Ruppel
High Tech High North County, San Marcos, CA 92078
Abstract:
{We will do this part together after you have written your first draft report}
Introduction
This lab focuses on chemical reactions, and the different variables that were manipulated to control the reaction, variables being ingredients. The reactions in the context of this lab are controlled by the amount of certain types of atoms. More of that atom makes the process speed up, while less slows the reaction down. This is because atoms have to collide with each other in the right place, and decreasing the amount of atoms makes the reaction take longer, as there are less opportunities to collide in the spot necessary. The lab was a fairly simple one, with the premise to try and get the reaction to reach a set point in 2 minutes, plus or minus five seconds. The reaction in itself was where iodine, vitamin c dissolved in water, 3% hydrogen peroxide, starch solution, and water. Once the first reaction, with set values on ingredients, was complete one variable at a time was to be altered to get the reaction to complete within the time constraint of 2 minutes. The chemicals, when mixed and given a few seconds, changed the color of the water that they were mixed in.
Experimental:
The first thing that happened was the first reaction, which was the control. After the reaction was complete (the chosen time was when the solution turned a deep orange), with the time taken being 57.49 seconds, the chemical that was chosen to be altered was the 3% hydrogen peroxide, which was decreased from sixty drops to thirty drops. After this reaction was completed, the time in total being 1:38.73, the amount of hydrogen peroxide was altered again, as this seems to have had an effect on getting the time taken closer to the assigned time. For the last reaction, we lowered the hydrogen peroxide from thirty drops to twenty drops, and this reaction had the desired effect, with the time that the point was reached at 2:01.37.
Results and Discussion:
See above.
Conclusions
Through reason, it can be figured that not one specific chemical needed to be altered, as any amount less than the control amounts would have resulted in more time to complete the reaction, as there would have been less atoms to react with each other, thus slowing the reaction. In all, although it may not seem like it, the smallest things do make differences. An interesting follow up would be to see if different reactions slow when the ingredients are modified.
References:
http://www.chemguide.co.uk/physical/basicrates/introduction.html